Round off the approximate number as indicated.21 2 significant digits
A. 21.1
B. 20.9
C. 21
D. 21.0
Answer: C
Mathematics
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For the smooth curve r(t), find the parametric equations for the line that is tangent to r at the given parameter value 
r(t) = (5 tan t)i - (3 sin t)j + (4 cos2 t)k ; t0 = 
A. x = 5 + 10t, y = -
+ 
t, z = 2 + 4t
B. x = 5 + 10t, y = -
- 
t, z = 2 - 4t
C. x = 5 + 10t, y = -
- 
t, z = 4 - 4t
D. x = 10 + 5t, y = -
- 
t, z= -4 + 2t
Mathematics
Find the indicated vector.Let u = 
. Find 3u.
A. 
B. 
C. 
D. 
Mathematics
Add or subtract. Write the answer in lowest terms.
+ 
A. 
B. 
C. 
D. 
Mathematics
If 
with B in QIII, find
?
A. ?
B. ?
C. ?
D. ?
E. ?
Mathematics